Compound steam-engine



6 Sheets-Sheet 1.

(No Model.) M. C. BULLOGK.

GOMPOUND STEAM ENGINE.

(No Model.) 6 Sheets-Sheet 2.

M. C. B'ULLOUK.

GDMPOUND STEAM ENGINE.

No. 274,437. Patented ]V.[a1'.20,1883.

(No Model.) 6 Sheets-Sheet 3.

M. C. BULLOGK.

GOMPOUND STEAM ENGINE.

No. 274,437. Patented Mar. 20, 1.883.

(No Moel.) I 6 Sheets-Sheet 4.

- M. C. BULLOGK.

GVOMPGUND STEAM ENGINE.

110,274,437. l#Pad-,elated Ma.1'.20,1883.

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(No Model.) 6 sheetssheen 5.

M. C. BULLOGK.

GMPOUND STEAM BNGXNE. No. 274,437.' Patented Mar. 20,1883.

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(No Model.) 6 Sheets-Sheet 6.

- M. C. BULLOGK.

GGMPOUND STEAM ENGINE.

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PATENT Fritze.

MILAN o. BUIILOGK, or CHICAGO, ILLINOIS.

COMPOUND STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 274,437, dated March 2Q, 1883.

Application filed June 24, 1881.

To all whom it may concern:

Be it known that I, MILAN C. BULLocK, a citizen ot the United States, residing at Chicago, in the county of Cook and State ot Illinois, have invented certain new and useful Improvements in Compound Steam-Engines; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters or figures of reference marked thereon, which form a part of this specilication.

My iuven tion consists of a two-cylinder steamengine for operating drilling and hoisting machinery, the steam induction and exhaust devices ot' which are so constructed and applied that the cylinders and their adjuncts may be used either conjointly, as a compound steamengine, or separately, as twoindependent highpressure steam engines having a common crank-shaft.

In order that my invention may be fully understood, I have illustrated in the annexed drawings, and willdescribe, the best form thereof at present known to me.

. Figure l is a front elevation of my improved steam rock-drill. Fig. 2 is aside elevation of the same. Fig. 3 is a vertical longitudinal section in the plane indicated by broken line l l in Fig. 1. Fig. l is a transverse section substantially in the two planes indicated by the broken lines 2 2 and :rin Fig. 2, and looking in the direction of the arrow thereon. Fig. 5 is a transverse section substantially in the planes indicated by the broken line 3 3 ot Fig. 3, and looking in the direction of the varrow thereon. Fig. 6 is a section in the plane indicated by broken line 4 et of Fig. 4. Fig. 7 is an isometrical perspective of one of the cross-heads. Fig. 8 is an isometrical perspective of one of the valve-rod guides. Figs. 9,

'10, 11, 12, and 13 are detail illustrations ofthe duplex eccentric. Figs. 14, 15, 16, 17, and 18 are detail illustrations of the steam induction and exhaust devices. Figs. 7 to 18 are drawn on a larger scale than the other figures 5 but the same letters of reference aroused in all the figures to indicate like parts.

All the machinery is supported on the bedplate A, and the three braced standards A A2 (No model.)

A3 bolted thereto. The steam-cylindersB and G, bolted to the bed-plate, are set at reverse angles of forty-dye degrees to the base thereof, and at right angles to each. other. Their pis` ton-rods work through suitable stuffing-boxes in the upper heads of the cylinders, and are connected to the respective pitmenB and C by means ot' cross-heads, preferably such as illusgle guide-bars suitably secured at one end to the cylinder and at the other end to a brace between the standards A and A2..

The cylinders are set in different transverse planes, in order that their pitmen may just pass each other and be' connected side by side to the same double crank, D', of the main or crank shaftD.V The slide-valve of each cylinder is secured to a stein which terminates at its outer end in a square or polygonal bar, forming a slide which is fitted and moves in a xed guide secured to the standard A2, as shown in Fig. 5, and in detail in Figs. 6 and 8. The two slide-valves are operated by one variable and reversible duplex eccentric, E, provided with the two straps E and Efrorn which the respective eccentric-rods E3 E4 extend divcrgingly to the slide-valve stems, to which they are pivoted. The eccentric is pivoted at c to an arm, c', fixed on the crank-shaft, which latter passes through a curved slot, c2, formed in the eccentric, so that the eccentric may be swung on its pivot c to adjust it'with reference to the double crank D. The curved slot c2 of the eccentric is so located and proportioned that the engine or engines may be reversed by swinging the eccentric from one extreme position to the other.

The eccentric thus pivoted is connected .by a1 link, e3, to an arm on the adjacent end of a sleeve, F, which is Iltted on the crank-shaft, so that it may be turned,l but cannot move endwise thereon. The sleeve is constructed with spiral ribs or threads f on its surface, and is encircled byaibush, (Sr/,in'which spiral grooves g are cut to engage the spiral threads on the sleeve. The bush is fixed in the split end of a tubular slide, G, so as to form a part thereof'. The tubular slide is encircled by a ring, G2,

studs on which are engaged by the forks of roo the reversing-lever H, by operating which the eccentric may he adjusted at pleasure.V The split endof the tubular slide is constructed with ears, so that the segments maybe drawn -trated in detail in Fig. 7, and running on sinsteam-inlet ofthe steam-chest ofthe smaller cyly the main exhaust-pipe L.

connected to or forms one branch ofthe caseKof a multi-way valve or cock, the plug K of which is provided with three separate and distinct passages, k la' k2, while the case is constructed with three `lateral branches besides the branch I", already mentioned. The exhaust-piper@ from cylinder C is connected to the branch K- of the cock. From the branch K3 of the same a jacketed steam-induction pipe, K4, leads to and covers the steam-inlet of the steam-chest of the larger cylinder, B, while another pipe, K6, leads from its branch K5 to the coupling L of the main exhaust-pipe L, with a nipple on the coupling, of which the exhaust-pipe BX from the larger cylinder, B, is also connected. The plug of the multi-way cock is provided with a leverhandle, K7, byfwhich it may be turned.

Whether the steam-cylinders and their adjuncts will operate conjointly as a compound steam-engine or independently as two separate high-pressure steam-engines depends upon the position of the plug of the multi-way cock. If they are to operate as a compound steam-engine, then the plug must be turned to the position shbwn in Fig. 15, so that live steam is admitted only to the smaller cylinder, and the exhaust-steam therefrom is further utilized by the larger cylinder before it reaches 1f, on the other hand, they are to operate independently as two separate high-pressure steam-engines, then the plug mustbe turned to the position shown in Fig. 16, so that live steam will be admitted to both cylinders and the eXhaust-steamfrom each discharged directlyinto the main exhaustpipe L.

In performing average drilling work, and for hoisting purposes, the engines should be used as one compound steam-engine, in order to economize steam and use it to the best adand mounted and driven in manner shown in the drawings. Detailed description thereof is deemed unnecessary herein, because it forms no part of my present'invention. The swivelhead M, carrying the drilling mechanism, is shown as constructed like the swivel-head described and claimed in my application for Letf ters Patent led January 27, 1881.

Beyond the iy-wheelN ashiftable spur-pinion, O, is mounted on the crank-shaft for driving the hoisting machinery, the hoisting-drum P of which is mounted on a shaft, P', located below the crank-shaft. Detailed description of this hoisting machinery is here omitted, because it is fully described in another application for Letters Patent, (filed of even date with the application for this patent,) wherein allits novel features of construction and arrangement are claimed.

` The cylinders and their valve chests*l are jacketed, and a steam-pipe, R, supplies these jackets and the jacket of steam-induction pipe K4 with live steam.

The claim covering the valve-shifting mechanism illustrated inthe accompanying drawings has been withdrawn from this case in compliance with the requirement of the Patent Office for division. Said valve-shifting gear or mechanism will form theA subject of a separate patent.

Having thus described my invention, what I claim is- The combination, substantially as before set forth, of two steam-cylinders operating on a common crank-shaft, and a multi-wayvalve or cock adapted to establish steam communication to the steam-induction pipe ofone ofthe cylinders, either from the throttle-valve direct or from the exhaust-pipe of the other cylinder, which is always supplied with steam direct from the throttle-valve.

In testimony whereofI affix my signature i-u presence of two witnesses.

, MILAN c. BULLOGK.

Witnesses:

CHAs. W. Gardes, J. EDWARDS FAY.

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